Draftsman s rule



(NoModeL) I F. BENZINGER & H. HGRABAU. DRAFTSMANS RULE.

No. 422,701. Patented Mar. 4, 1890.

WITNESSES: l/VVE/l /TUR XRXJTW. dim

UNITED STATES PATENT OFFICE.

FREDERICK BENZINGER, OF NEW YORK, N. Y., AND HANS EDGAR GRAlBAU,

OF HOBOKEN, NElV JERSEY.

DRAFTSMANS RU LE.

SPECIFICATION forming part of Letters Patent No. 422,701, dated March 4,1890. Application filed October 22, 1889. Serial No. 327,806. (Nomodel.)

To all whom it may concern.-

Be it known that we, FREDERICK BENZING- ER, a citizen of the UnitedStates, and a resident of New York city, in the county and State of NewYork, and HANS EDGAR GRA- BAU, a German citizen, and a resident ofHoboken, in the county of Hudson, State of New Jersey, have inventedcertain new and useful Improvements in DraftsmansRules,of which thefollowing is a specification.

This invention relates to improvements in the rules used by draftsmen,and especially to that class of rules known as fiat rules.

The fiat rules made heretofore were made flat on top and were beveledtoward the side edges, and in order to lift them from the table,drawing-board, or paper it was necessary to insert the finger-nailsunder the edges of the rule, which made handling of the rule more orless inconvenient.

The object of our invention is to provide a new and improved rule whichcan easily be grasped, held, and shifted.

The invention consists in the flat rule provided on its upper surfacewith a longitudinal handle-ridge.

In the accompanying drawings, Figure 1 is a perspective view of ourimproved draftsmans rule. Fig. 2 is a perspective view of a modifiedconstruction of the same. 7

Similar letters of referenceindicate corresponding parts.

The rule A, which may be made of wood, ivory, hard rubber, or any othersuitable sub stance, is provided along its edges with bev els a, uponwhich the scalesubdivisions are produced in the usual manner. At theupper edge of each bevel a a longitudinal groove 1) is formed in the topof the rule, and between said grooves the raised longitudinal handleprojection B is formed.

As the rules of this kind require a greater thickness of material thanthe ordinary fiat rules, and much of this material will go to waste informing the bevels a and b, the 1011- gitudinal raised handle projectionB can be made as. a separate dovetailed piece which can be inserted intoa longitudinal dovetailed groove in the top of the rule.

Having thus described our invention, we

claim as new and desire to secure by Letters Patent- 1. Aliat draftsmansrule provided with the side bevels a, the longitudinal grooves 5,adjacent to said bevels, and the raised handle projection B between saidgrooves b, substantially as set forth. 7

2. The combination,with a flat draftsmans rule, of a longitudinal,raised handle-piece dovetailed into the top of said rule, substantiallyas set forth. i

In testimony that we claim the foregoing as our invention we have signedour names in presence of two subscribing witnesses.

FRED. BENZINGER.

HANS EDGAR GRABAU.

Witnesses:

OSCARVF. GUNZ, W. REIMHERE.

